got the sense of a g*ddamn dog

[Mike Hussey]

Edmund investigating Sugar for Night Owl Murders:

SUGAR: Louis gave it up at Casitas, man. I was the boss jock in my dorm. Louis was the sissy. Louis gave it up for f*cking candy bars. He ain't got the sense of a g*ddamn dog.

What does "got the sense of a g*ddamn dog" mean?
Source: Source: L.A. Confidential (a 1997 American neo-noir crime film directed, produced and co-written by Curtis Hanson.)

 

[Skrej]

See definition 6 A (and to some extent 6 B). He doesn't even have the mental faculties of a dog.